如何拍摄基于AndroidViews实现的WebView屏幕快照(webview_flutter)?

时间:2019-10-19 17:16:29

标签: flutter webview screenshot

我需要从webview_flutter截取WebView的屏幕快照,但这不起作用。

我有一个应用,该应用必须对WebView进行截图,然后对其进行处理。我试图用Screenshot包来做。我发现此信息https://github.com/fluttercommunity/flutter_webview_plugin/issues/181#issuecomment-497625384

从链接中,我了解到无法通过Screenshot插件来做到这一点。

Screenshot(
          controller: _screenshotController,
          child: WebView(
            initialUrl: widget._webUrl,
            onWebViewCreated:
                (WebViewController webViewController) {
              if (_controller.isCompleted == false)
                _controller.complete(webViewController);
            },
          ),
        );



  void takeScreenshot() {
    _screenshotController.capture().then(
            (File image) async {
          _screenshot = image;
        }
    );

当我截取屏幕截图时,我得到了透明的png图像,而我想捕获WebView内容

1 个答案:

答案 0 :(得分:0)

正如我向类似的issue报告的那样:

您可以使用我的插件flutter_inappwebview,它是Flutter插件,允许您添加内联WebView或打开应用程序内浏览器窗口,并且具有许多事件,方法和选项来控制WebView。 / p>

要获取屏幕截图,可以使用InAppWebViewController.takeScreenshot方法,该方法获取WebView可见视口的屏幕截图(PNG格式)并返回Uint8List

下面是一个示例,该示例在页面停止加载时获取WebView的屏幕快照,并显示带有相应屏幕快照图像的警报对话框:

import 'dart:async';
import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:flutter_inappwebview/flutter_inappwebview.dart';

Future main() async {
  WidgetsFlutterBinding.ensureInitialized();
  runApp(new MyApp());
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => new _MyAppState();
}

class _MyAppState extends State<MyApp> {
  @override
  void initState() {
    super.initState();
  }

  @override
  void dispose() {
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(initialRoute: '/', routes: {
      '/': (context) => InAppWebViewExampleScreen(),
    });
  }
}

class InAppWebViewExampleScreen extends StatefulWidget {
  @override
  _InAppWebViewExampleScreenState createState() =>
      new _InAppWebViewExampleScreenState();
}

class _InAppWebViewExampleScreenState extends State<InAppWebViewExampleScreen> {
  InAppWebViewController webView;
  Uint8List screenshotBytes;

  @override
  void initState() {
    super.initState();
  }

  @override
  void dispose() {
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(title: Text("InAppWebView")),
        body: Container(
            child: Column(children: <Widget>[
          Expanded(
              child: InAppWebView(
            initialUrl: "https://github.com/flutter",
            initialHeaders: {},
            initialOptions: InAppWebViewGroupOptions(
              crossPlatform: InAppWebViewOptions(
                  debuggingEnabled: true),
            ),
            onWebViewCreated: (InAppWebViewController controller) {
              webView = controller;
            },
            onLoadStart: (InAppWebViewController controller, String url) {},
            onLoadStop: (InAppWebViewController controller, String url) async {
              screenshotBytes = await controller.takeScreenshot();
              showDialog(
                context: context,
                builder: (context) {
                  return AlertDialog(
                    content: Image.memory(screenshotBytes),
                  );
                },
              );
            },
          ))
        ])));
  }
}